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the solution:
7
9
5
8
2
6
1
4
3
2
1
8
3
5
4
9
7
6
3
6
4
7
9
1
2
5
8
4
2
7
9
6
5
3
8
1
9
8
1
2
7
3
4
6
5
5
3
6
4
1
8
7
2
9
1
5
9
6
4
7
8
3
2
6
7
3
1
8
2
5
9
4
8
4
2
5
3
9
6
1
7